iface-modem-3gpp-profile-manager: fix requested IP type normalization
mm_iface_modem_3gpp_profile_manager_set_profile() was changed so that the input profile object was not touched, and instead a copy of the same would be used within the method.
Unfortunately, that change missed the update of the IP type normalization step, which would end up modifying the original settings instead of the newly created copy.
Fixes 74649409